Simulium (Nevermannia) angustitarse (LundstroÈm)

Crosskey, Roger W. & Crosskey, Margaret E., 2000, An investigation of the black ¯ y fauna of Andalusia, southern Spain (Diptera: Simuliidae), Journal of Natural History 34 (6), pp. 895-951 : 919-920

11. Simulium (Nevermannia) angustitarse (LundstroÈm)

Spain references: GonzaÂlez PenÄa et al. (1986), GonzaÂlez PenÄa (1990, as Simulium (Nevermannia) sp.), GonzaÂlez (1997).

Andalusia records

Authors’ material. Site 17: 1 larva. Site 18: 8 larvae. Site 58: 2 larvae. Site 60: 4 larvae (28.v.1986). Site 64: 8 pupae, 12 larvae. Site 101: 2 (l1), 7 pupae, 14 larvae. Site 132: 3 larvae.

Previous reports. None, but known from a site just north of the Andalusian borderÐCiudad Real: Arroyo Cereceda, headwater of RõÂo Yeguas, 700 m (UH87354 5) (ref. GonzaÂlez PenÄa, 1990).

Remarks

Amongst our Andalusian material is a species which we identify provisionally as S. angustitarse ; however, the pupal gill diOEers somewhat from the branching con®guration seen in typical pupae from more northerly areas of Europe where the species is best known. Larvae and a reared male (its genitalia slide-mounted) obtained with our pupae are certainly conspeci®c and show no evident diOEerences from typical angustitarse . The species concerned is undoubtedly the same as that identi®ed as angustitarse by GonzaÂlez PenÄa et al. (1986) from the river Yeguas headwaters and later referred to as Simulium (Nevermannia) sp. by GonzaÂlez PenÄa (1990). The cocoon of our pupae shows the loose weave usual in S. angustitarse but the gill (®gures 19, 20) diOEers slightly from that of typical pupae by having the upper common stalk elongate (two or three times as long as wide) instead of very short. This diOEerence might reēct the existence of two species but is not substantial in the absence of any other observed diOEerences and at present we identify our specimens as S. angustitarse . The gill branching of our pupae agrees exactly with that ®gured by GonzaÂlez (1997).

The collection of the Natural History Museum, London, contains reared adults, pupae and larvae of S. pinhaoi Santos GraÂcio , a ru®corne -group species known only from Leiria District on the west coast of Portugal, and we have been able to compare our Andalusian material with pinhaoi . The pupal gill branch con®guration is very similar (shown for pinhaoi in ®gure 23) but the Andalusian specimens cannot be identi®ed as this species: in our reared males from Site 101 the postnotum is bare (i.e. normal for subgenus Nevermannia ) whereas in S. pinhaoi the postnotum has two patches of hair-scales like those seen in all species of the subgenus Eusimulium .